Platen-release mechanism.



0, SPIROQ .PLATEN RELEASE' MEQHA'Nt-SM.

" APPLICATION FILED APR.20, 1914.

1 1 5 1,059 Patented Aug. 24, 1915.

CHARLES SPIRO, or NEW- YORK, n. y.

' marlin-RELEASE MECHANISM.

1,1 51Qo59. I

To all who? it mag concern Be =r known that I, CnARLns-Srmo, citizen of the United States, residing at New York, in the county of New, York and State of N ew. York. have in vent-edcertain new and useful Improvements in .llaten Release Mechanism, of which the following is a specification. I

This invention relates.. to a. platen release mechanism and particularly to a construction wherein the platen may be ,fed by. a

- pawl and ratchet movement or rotated in- 'dependentl y thereof to any desired position. The. invention has for an" Ob]6(i to present anovel and improved construction wherein the ratchet wheel is frict onally held upon the platen shaft and is retained in adjusted position by a movable detent contacting therewith, in connection with means for holding said detent against movement relative to the ratchet wheel .80 that the platen shaft may be mtatedi independently of the locked ratchet-wheel.

Another-object of the invention is to providea swinging detent to engage the ratchet wheel and having pivotally nounted thereon a line space gage to cooperate with the feed pawl for saidratch'et wheel. i Other and further objects and advantages "of the invention will be hereinaften set forth and the novel features thereof defined bythe appended claims.

In the drawing Figure 1 is a front elevation, of the mechanism; ,Fig, 2 is a. section on line 2 2 of Fig. 1 Fig. 3 is a loi'igitudinal section through the platen .shaft and frictionally held ratchetthereon; Fig. 4 is a detail perspective of the line space gage;

' Fig. 5 is a similar view of the detenthold.-

ing lever. and Fig.- 6 a detail perspective of the detent.-

Like numerals of references refer to like parts in the several figuresof the drawing.

The invention is applicable to any type or character of-typewriter and 'the numeral 10 designates a platen which may be of any 1 desired construction. The shaft 1.1--fro1i1 this platen is provided with a loosely. mounted ratchet wheel 12 which is frictionally held thereon by acupped spring washer. 13 secured to the shaft by means of a pin ll extending therethrough and entering. slots or cuts 15in said washer. The end l( o.f the shaft 11' has. mounted thereon a sleeve 17 p which carries the operating handle or Application filed April 20, 1914. Serial'No. 833,144.

knob 18 and is secured in position by a screw 19 entering the end of the said shaft Specification of Letters Patent. PatntdfAug, 24, 1915, 1

A cupped spring washer 20 is interposed between the end: of .the sleeve 17 and the-- ratchet wheel- 12 and isheld under the proper frictional tension by the screw 19; The spring washers and their connections are shown as-a desirableform for friction-. ally connecting the ratchet wheel to the platen shaft but other constructions may be used for accomplisl'iingthis purpose.

Choperating witlrthe teeth of the ratchet wheel 12 is a detent roller or retaining member 21 carried by the line space det-ent which is pivotally mounted'at 23 in a. fixed part 21 of the carriage. This roller is held,

in constant yielding contact with the ratchet wheel by means of a spring mounted upon the part 24 and engaging'the upper portion of-the detent. as shown at 26. 'This (ietent is formedwvith parallel lateral flanges 27 and 28 at its opposite ends, the latter being formed. with lugs in: which theroller 21 is pivoted. In these flanges the line space gage 29 .is'rotatably mounted and has at is upper end anindicatingblock adapted to bear any desired characters to.-

indicate the space to'be fed, I p

The lower end of the gage 29 l1as secured there m astop plate31 by means of a screw This plate hasc'ontact faces 33 at respectively different distances from its axis adapted to contact with theswinging lever 31 pivoted {W aml 'nrryiug a1t' its fi'ee eml' the feed pawl 36 to engage the ratchet wheel 12. These parts are of the usual construction and operated by any proper ordinary connections;

For the purpose of .ho lding or locking the deteiit 22 against 1uovement relativeto, the ratchet wheel 12 a lever 37 is provided and Y pivotally mounted upon a fixed part 38 by the screwfitl. Th is lever is formed with a fin er hold 40 and a sto )in 41 which when the detent is released rests upon the upper device. for engaging. the 'd-etentor to be thrown iuto'vits path of travel to prevent movement thereof, but the inventionis not specifically con fined thereto.

In the normal line spacing opcration'the detent is released ainl yieldiugly contacts avit h the ratchet wl1eel \v-hich-is frictionally held with sufiicicnt tension to rotate. :the'

platen, threu 'h the usual line space feed mechanism. f it be desired to rotate the platen and leave the ratchet-wheel in its )ro )er relation to the detent, the latter is ieh or locked by the lever thrown into the path of movement thereof, as indicated by dotted lines .in' igs.'-1"antl-2. The platen may then be turned to any desired-extent by the knob upon its shaft and the spring washers slide ,upen the Ratchet .wheel which is held by thmdetent so that the platen shaft rotates .higlependently thereof. lhisrpermits the platen to .be turned to a line .or a point enabling the operator .to write on such :line or between lines, or to inter. Q'late a word or letter. W-l\enthe,holdi ng. ever Iis-in full line position the .detent is released and the line spacin proceeds-througlrthe feed awl in ,the .nsaa anannen-the extent of feed iowever being determined by the line B ace gage carn ed by the detent and centre ing the travel .of said pawl. ,Ilhe invention presents a sim le, economically constructed, and very eiiqient form of platen release mechanism.

What 1 claim is:-.- a

1. In a platen release mechanism, the combination ,of ,a frictionally held ratchet wheel upon a platen shaft, a retaining detent pivoted intermfdiate its ends and adapted at one end 0 {engage -.sai'd wheel, and means ionpositively locking said detent at the opposite side, oft-its. ivotaagainst movement relative ,to saidiratc let .wheel.

2. In 'a typewriter platen the combination with a line spacing member adapted to be rotated with the platen shaft, ofa detent pivoted intermediate .its ends and contacting with said member at-one end, and

.means engaging said .detent at the opposite side of .its )ivot by which said member may be retained against movement te produce a drag thereof upon said shaft.

8. In a platen release mechanism, the combination of a frictienallv heldratehet wheel upon a platen shaft, a (ctent=pivotcd intermediate its ends and hearing at one end against said wheel, and means extending into the path of movement of the opposite end of' said detent for pesitivel holdin the same in contact with said rate iet whee 4. In a -.platenrclease mechanism, the combination of a frictionally held ratchet wheel upon .a platen shaft,a detent pivoted intermediate its ends and bearing at one end against said wheel, and a swingin member adapted to'be thrown into the patli of movement of the opposite endef said detent to positively lock it in position.

6. In a platen release mechanism, the mmbination oi a .irietionally-held ratchet wheel uponn platen shaft, a detent-pivettal intermediate its ends and bearin at one end against said wheel, and a mem er adapted to be shifted into position to engage the opposite" end'of said detent to lock it in contact with said ratchet wheel.

0. In a-platen release mechanism, the combination of a frictionally held ratchet wheel upon a platen shaft. an oscillating detent pivoted intermediate its ends and having one end yieldin' ly held in contact with said-wheel, and locliing means movable into the path of movement of the opposite end of said detent to hold the same in contactwith 1 said ratchet .w heel.

.7. In: a pla-t'en. release mechanism, the combination .of a; irictionally held ratchet wheel upon a platen shaft, an oscillating (letent pivoted intermediate its ends and havin roneend .yieldingly held in-contaet with said wheel, and a locking lever pivoted above said detent and adapted to lie/thrown into ithe path of movement of the opposite end thereof.

8. In a platen release mechanism, the combination .of a 'frictionally :held ratchet wheel aipon a platen shaft, a detent swinging in a vertical plane and pivoted intermediate its .0lldS.lfllld yieldingly held in contact with said wheel,ailocking lever pivoted above saiddetent and adapted to be thrown into .the. path. of movement of one end thcreofmmd a stepcarried by said lever to determine-its adjusted positions- I 9. In a platen-release; mechanism, the combination with a line-space member upon a platen shmfit, .of a detent pivoted intermediate its ends and yieldine'ly held in contact with said .member,--ame. space gage mechanism mounted-in on said detent,-. and locking means movab e into the path of oscillating movement of a portion 0't'- sa.id mechanism to hold the detent. in contact with said members-oh .5 i

10. In a. platen release mechanism, the combination .of'a frictionally held ratchet wheel upon a )laten shaft/,a-swingin detent. yieldingly he d in contact with sai wheel, a line space gage mounted on said detent and having-a head portion extended therefrom, a locking .levcr movable into the path of movement of said portion, a stop )late carried b said go 0, and a feed pawl for 88,111. ratc et whee cooperating with said p a e. I

11. In a platen release mechanism, the combination of a platen shaft, a ratchet wheel loosely mounted thereon, a spring plate mounted upon said shaft and engaging said wheel, a seeve bearing against said spring plate -to iforee it into contact with said wheel,- and anladjustableserew mounted upenzsaid platen Sllitffizitfld having its head centactingavith'the outer end of said sleeve.

12. In a platen release mechanism, the combination of a platenmhait, a ratchet wheel :leosolv -in'ounted thereon, friction means cauried by said shaft in contact with iaoi said wheel, a sleeve mounted upon the end of said shaft, a cupped spring w'as'lierinterv posedflbetweenl said sleeve and wheel, and

"means for adjustably' forcing said sleeve in contact with said last mentioned washer.- .13.v In a platen release mechanism, the

' combination of a frictionally held ratfchet \vheelupon a platen shaft, a detent pivoted il itenne diate -its ends and having parallel- Jflanges at' opposite ends, an extended, mem

' her mounted inflsaid flanges, means for retain'ing one end of said detent yieldingly in contactfwith said wheel,-and means for'lockding said member against movement.

' .14. In jgaiplaten release mechanism, the,

combination of a frictionally' held ratchet wheel 'upona platen shaft, a'pivoteddetent cooperating with said ratchet wheel I 151 In a platen release. mechanism-,"the

. conihination of frictionally held ratchet wheel upon ap-laten shaft, afpivoted detent having.parauL ng S at Opposite ends inean's'for retaining one end'of said detentyieldi-ngly in contact witlrsaid wheel, a line space" gage post pivoted in" said flanges, a stop'plate at the lower end of said postliaw ing contact faces at difi'erentdistances from i its aXis,-'an d;a feed pawlIcontrolledhy saidplate and cooperating. {with 'saidiratchet platen release mechanism, the

Wheel; i

16.- In a combination of..a frictionally held ratchet ,wheel upon a platens'haft, a pivoted detent having parallel flanges at opposite'ends,

means for retaining one/end of said'detent yieldingly in contact with. said wheel, a line, space gage post pivoted'ln-said fianges,.'an

indicating headfatjthe upper "end ofsaid post, a locking'lever for s'aiddetent adapted to' be thrown into the path'ofi movement of said head, as'top plateat thelower end of said post .having contact faces at different distances from; its axis and a feed pawl controlledl' by said, plate and with said ratchet wheel,

' In 'testimonvwhereof I, aflix I my si gnatu-r'e in presence of two witnesses.

\Vitnesses i v p ,7 STEPHEN" 1F. CURTIS,

DA IEL L. B Y'LIsQ V CHARLES SPIRO.

cooperating 

